Annex; Mcu (Motor Control Unit); Extract From The Technical Description; Application - Siemens 8DJH Installation And Operating Instructions Manual

12 Annex

12.1 MCU (Motor Control Unit)

12.1.1 Extract from the Technical Description

12.1.2 Application

12.1.3 Design

500-8384.9 • Version 11 • Installation and Operating Instructions • 8DJH
The switchgear can be equipped with different versions of the electrical motor control unit
(MCU, Motor Control Unit). The following sections are an extract from the Technical Description
of the electrical motor control unit.
The complete Technical Description of the different versions is available under the following
order numbers:
MCU version
MCU-RI
MCU-MH
MCU-MH-MOD
The MCU controls the following motor operating mechanisms for three-position switches in
medium-voltage switchgear:
▪ Spring-operated mechanism
▪ Spring-operated/stored-energy mechanism
The MCU is equipped with a universal wide voltage range. It can optionally be connected to
different auxiliary and motor voltages. The auxiliary and motor voltages can be combined and do
not necessarily have to be identical.
Fig. 188: MCU-RI
1 LED status indicator
2 Reset pushbutton
Insufficient voltage quality
The functioning of the MCU may be impaired.
⇨ The voltage quality of the voltages used for auxiliary and load circuits must correspond
to applicable standards.
⇨ If an AC control or AC load voltage is used, which is generated directly from single-phase
inverters, earth U
N2~
Order number
953-0091.9
953-0071.9
953-0081.9
Fig. 189: MCU-MH
NOTICE
.
Fig. 190: MCU-MH-MOD
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